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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4832d349de641cc2d7a0f0d9c45ed9997685bdb83baa8daed1f648add914e861' 
  AND token = 'VorC6IkWuQCCZZK8HbIoME/aVpGzJG6qFbJra/FVB8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}